Remove ENABLE(OILPAN) uses in wtf/

third_party/WebKit/Source/wtf/HashCountedSet.h

Index: third_party/WebKit/Source/wtf/HashCountedSet.h
diff --git a/third_party/WebKit/Source/wtf/HashCountedSet.h b/third_party/WebKit/Source/wtf/HashCountedSet.h
index b6a5048f67b7b306c2cee958d28a884a3e75ef00..d5e6e1c223a88e03db05ad20d6b3644df32d7024 100644
--- a/third_party/WebKit/Source/wtf/HashCountedSet.h
+++ b/third_party/WebKit/Source/wtf/HashCountedSet.h
@@ -159,13 +159,6 @@ inline void copyToVector(const HashCountedSet<Value, HashFunctions, Traits, Allo
         vector[i] = (*it).key;
 }
 
-#if !ENABLE(OILPAN)
-template <typename T, typename U, typename V>
-struct NeedsTracing<HashCountedSet<T, U, V>> {
-    static const bool value = false;
-};
-#endif
-
 } // namespace WTF
 
 using WTF::HashCountedSet;